'\" te
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.TH USE_ENV 3XCURSES "Jun 5, 2002"
.SH NAME
use_env \- specify source of screen size information
.SH SYNOPSIS
.LP
.nf
\fBcc\fR [ \fIflag\fR... ] \fIfile\fR... \fB-I\fR /usr/xpg4/include \fB -L \fR /usr/xpg4/lib \e
\fB -R \fR /usr/xpg4/lib \fB -lcurses \fR [ \fIlibrary\fR... ]

\fBc89\fR [ \fIflag\fR... ] \fIfile\fR... \fB-lcurses\fR [ \fIlibrary\fR... ]

#include <curses.h>

\fBvoid\fR \fBuse_env\fR(\fBbool\fR \fIboolval\fR);
.fi

.SH PARAMETERS
.sp
.ne 2
.na
\fB\fIboolval\fR\fR
.ad
.RS 11n
Is a Boolean expression.
.RE

.SH DESCRIPTION
.sp
.LP
The \fBuse_env()\fR function specifies the technique by which the
implementation determines the size of the screen. If \fIboolval\fR is
\fBFALSE\fR, the implementation uses the values of \fIlines\fR and
\fIcolumns\fR specified in the \fBterminfo\fR database. If \fIboolval\fR is
\fBTRUE\fR, the implementation uses the \fBLINES\fR and \fBCOLUMNS\fR
environmental variables. The initial value is \fBTRUE\fR.
.sp
.LP
Any call to \fBuse_env()\fR must precede calls to \fBinitscr\fR(3XCURSES),
\fBnewterm\fR(3XCURSES), or \fBsetupterm\fR(3XCURSES).
.SH RETURN VALUES
.sp
.LP
The \fBuse_env()\fR function does not return a value.
.SH ERRORS
.sp
.LP
No errors are defined.
.SH ATTRIBUTES
.sp
.LP
See \fBattributes\fR(7) for descriptions of the following attributes:
.sp

.sp
.TS
box;
c | c
l | l .
ATTRIBUTE TYPE	ATTRIBUTE VALUE
_
Interface Stability	Standard
_
MT-Level	Unsafe
.TE

.SH SEE ALSO
.sp
.LP
.BR del_curterm (3XCURSES),
.BR initscr (3XCURSES),
.BR libcurses (3XCURSES),
.BR attributes (7),
.BR standards (7)
